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问题 单项选择题

根据《联合国国际货物销售合同公约》，关于货物风险转移，下列表述正确的是（）

A.涉及运输的，货物风险在货物越过船舷时转移

B.海上运输的货物风险一律在货交承运人时转移

C.货物风险一旦转移给买方，买方即无权宣告合同无效

D.货物在运输途中销售的，货物风险一般在合同订立时转移

答案

参考答案：D

单项选择题

Most computer systems are (26) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (27) to an outsider attack by preventing (28) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (29) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (30) by tools referred to as Intrusion Detection Systems.

A．visit

B．access

C．I/O

D．read/write
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单项选择题

轴的材料主要采用（）。

A.碳素钢和铝合金

B.铝合金和铜合金

C.碳素钢和合金钢
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